Note: In order to use keyboard shortcuts in Gmail at all, remember that you'll need to enable them by heading to your Gmail Settings and turning keyboard shortcuts on in the General settings tab.

Change Message Priority with '+' (plus) or '-' (minus)

Google's new Priority Inbox learns what messages are important to you and tries to bring the most important to the top. If it gets it wrong, you can mark any message as important or unimportant by selecting it and clicking the new plus or minus buttons in the toolbar.

If you want to do the same from the keyboard, though, you just navigate to the message you want to change using the 'j' and 'k' shortcuts, hit 'x' to select the message or messages you want to re-prioritize, and then hit either the '+' (plus) or '-' (minus) sign. As you might expect, the plus sign marks a message as important, while the minus sign marks a message as unimportant.

Note: You can actually press either '+' (i.e., hold Shift and press '=') or just '=' to mark a message as important. To demote a message, only '-' works.

Make a Phone Call from Your Keyboard with 'g' then 'p'

If you're using Gmail's new calling feature, they've introduced one more quick and convenient shortcut. You may already know that Gmail uses the 'g' key in conjunction with other keys to navigate to different folders or labels. For example, pressing 'g' then 'i' takes you to your inbox.

The 'g' shortcut also works for phone calls now, too. Type 'g', then 'p' to bring up Gmail's new phone dialer. Type the name of the contact you want to call and let the autocomplete take care of the rest.

And the Rest?

We've highlighted Gmail's best keyboard shortcuts before, but just remember: If you can't remember every shortcut, just memorize one: '?' (question mark). It opens Gmail's shortcut help so you can find any elusive shortcut you can't remember.